#include <iostream>
using namespace std;

int day[] = {0,31,29,31,30,31,30,31,31,30,31,30,31};

int main(){
	int dat1,dat2;
	cin >> dat1 >> dat2;
	int ret = 0;
	for(int i = 1;i <= 12;i++){
		for(int j = 1;j <= day[i];j++){
			int k = j % 10 * 1000 + j / 10 * 100 + i % 10 * 10 + i / 10;
			int num = k * 10000 + i * 100 + j;
			if(num >= dat1 && num <= dat2) ret++;
		}
	}
	cout << ret << endl;
	return 0;
}
